JP6657886B2 - Writing implement - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a writing instrument having a writing tube that implements a function for performing writing, housed in a barrel.

  Ballpoint pens and mechanical pencils are well known as typical examples of this type of writing implement. A ball-point pen is a refill in which a writing mechanism unit having a ball for transferring ink to paper or the like is attached to a tip portion of a container filled with ink, and the refill is housed in a barrel as a writing core. It protrudes from the tip of the tube. In the mechanical pencil, a mechanism for feeding out a pencil lead, which is a writing lead, is built in the barrel.

  The outer peripheral surface of the shaft cylinder held by the user's fingers is often cylindrical, but there are also those that have a hexagonal cross-sectional shape like a traditional pencil and those that have a triangular cross-sectional shape like a traditional pencil (For example, see Non-Patent Document 1 below). Further, there is a case in which a concave portion that is recessed toward the axis of the shaft tube is formed at a predetermined portion of the shaft tube having a cylindrical outer shape (for example, see Patent Document 1 below).

JP 2005-138420 A

"Ball pen / mechanical pencil / pencil sharp", Kokuyo General Catalog 2015 Edition Stationery, KOKUYO Corporation, December 2014, p. 539-545

  An object of the present invention is to provide a writing instrument in which the direction and posture of a shaft cylinder are stable and writing is easy even when a user does not apply force to fingers.

In the present invention, the shaft cylinder held by the user's finger has a rear portion extending in the axial direction, and a front portion extending in the axial direction extending in front of the rear portion and extending along the axial direction. Is formed in a flat surface or a substantially flat surface convex curved surface, and the only flat surface region which is extended in parallel or substantially parallel to the axial direction is formed in other portions, and the other portions are more curved than the flat surface region. front and, tapers tapered succession in front of said front, and a tip projecting the brush tip for writing, the curved region of the outer circumferential surface of the front part has a greater curved surface area of the The portion connected to the flat surface region in (2) bulges outward from the outer peripheral surface of the rear portion, and the writing instrument has a cylindrical outer peripheral surface as a whole .

  It is preferable that the flat surface region on the outer peripheral surface of the front part and the outer peripheral surface of the tip part are continuous in a convex curved shape.

  The curved surface region on the outer peripheral surface of the front portion may be substantially flush with the outer peripheral surface of the rear portion except for a portion connected to the flat surface region. In this case, it is possible to create an appearance in which the rear part to the front part of the barrel is continuously continuous, and it is possible to enhance the appearance and appearance of the writing implement.

  Alternatively, assuming that the curved surface area on the outer peripheral surface of the front portion bulges outward from the outer peripheral surface of the rear portion, the outer diameter of the front portion regardless of the outer diameter of the rear portion of the barrel. Can be easily designed to have an optimal size that fits into the fingers of the user. In other words, the front part can be made thicker than the rear part.

  If the outline of the flat surface area on the outer peripheral surface of the front part and the outline of the outer peripheral surface of the rear part form the same linear shape or substantially the same linear shape, the flat surface area of the front part becomes the outer peripheral surface of the rear part. Conversely, it does not protrude significantly.Conversely, the outer peripheral surface of the rear part does not protrude more than the flat surface area of the front part, which makes it easier for the user to hold the barrel naturally, and is used by the rear part of the barrel. The pressure on the base of the forefinger of the person is reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the direction and attitude | position of a shaft cylinder are stabilized, and a writing implement which is easy to write can be implement | achieved even if a user does not apply force to a finger.

1 is a perspective view of a writing instrument according to a first embodiment of the present invention. The top view of the writing implement of the embodiment. The side view of the writing implement of the embodiment. The front view of the writing implement of the embodiment. The sectional view on the AA line of the writing implement of the embodiment. The BB sectional drawing of the writing implement of the embodiment. The perspective view of the writing implement of the second embodiment of the present invention. The top view of the writing implement of the embodiment. The side view of the writing implement of the embodiment. The front view of the writing implement of the embodiment. The CC sectional view of the writing implement of the embodiment. The DD sectional view of the writing implement of the embodiment. The figure which shows the use condition of the writing implement which concerns on this invention.

  <First Embodiment> An embodiment of the present invention will be described with reference to the drawings. The writing implement of the present embodiment shown in FIGS. 1 to 6 is a rear-end knock type ballpoint pen. The writing instrument includes a writing core that implements a function for performing writing, a shaft cylinder 1 that is held by a user's finger when the user performs writing, and a knock rod that is arranged on the rear end side of the shaft cylinder 1. A knock mechanism is provided for knocking the writing tip 2, that is, the tip portion of the writing lead, from the front end (tip) side of the barrel 1 when the knocking operation is performed on the writing tip 3. The barrel 1 accommodates the writing core and the knock mechanism therein.

  The writing core is a refill in which a writing mechanism 2 having a ball for transferring ink to paper or the like is attached to a tip portion of a container filled with ink. The knock mechanism causes the writing mechanism 2 as the writing tip to protrude from the barrel 1 in response to the depression of the knock bar 3 and the writing mechanism 2 projecting from the barrel 1 in response to the depression of the knock bar 3 again. This is a well-known Kern type knock mechanism that is immersed in the barrel 1.

  The shaft cylinder 1 includes a hollow cylindrical rear shaft 11 and a front shaft 12 each extending along the axis L so that a writing lead can be inserted therein. One of the front end of the rear shaft 11 and the rear end of the front shaft 12 is provided with a male screw, and the other is provided with a female screw hole. The shaft 12 is combined with the shaft 12 to form an integral shaft cylinder 1. The front shaft 12 is obtained by covering an outer periphery of a cylindrical base 121 with an exterior body 122 that is in direct contact with the user's finger. Note that the base 121 and the exterior body 122 can be formed at a time by two-color molding.

  The barrel 1 of the writing instrument according to the present embodiment includes a rear portion 13 extending along the axis L direction, a front portion 14 extending in front of the rear portion 13 and extending along the axis L direction, and a front portion 14 extending in the axis L direction. It has a tapered distal end portion 15 that is tapered and has a diameter that decreases as it goes forward. Most of the rear portion 13 is formed by the rear shaft 11, but the front end portion, the front portion 14, and the front end portion 15 of the rear portion 13 are formed by the front shaft 12. The writing mechanism 2 of the writing core protrudes from the tip 15 thereof.

  The outer peripheral surface of the rear portion 13 is entirely cylindrical. In contrast, a single flat surface region 141 and a curved surface region 142 other than the flat surface region 141 exist on the outer peripheral surface of the front portion 14. The flat surface region 141 is a portion of the outer peripheral surface of the front portion 14 where the user's finger touches, and has a substantially flat surface shape that is expanded parallel or substantially parallel to the axis L direction. In particular, as shown in the cross-sectional view along the line AA in FIG. 5, in this embodiment, the flat surface region 141 is not a completely flat surface, but is outward (separated from the axis L of the barrel 1 (or writing implement)). (A direction in which the convex curve is formed). A convex surface is defined as a curved surface such that a line segment connecting any two points on the curved surface along the shortest path along the curved surface is outside or equal to a straight line connecting the two points. Say. In short, the convex curved surface is a curved surface that does not have a depression that is recessed toward the axis L of the barrel 1. However, the flat surface region 141 may be formed into a completely flat surface.

  The flat surface region 141 of the outer peripheral surface of the front portion 14 is continuous to form a convex curved surface with the outer peripheral surface of the tip portion 15 having a truncated conical shape. There is no recess at the boundary toward the axis L of the barrel 1. In other words, the profile 141a of the flat surface area 141 in a side view shown in FIG. 3 (a state viewed from a side perpendicular to a direction of a planar view in which the flat surface area 141 looks largest as shown in FIG. 2). And the contour 15a of the outer peripheral surface of the tip portion 15 are continuous so as to form a convex curve. The convex curve refers to a curve in which a portion of the curve connecting any two points on the curve is outside or equal to a straight line connecting the two points.

  In addition, in the side view shown in FIG. 3, the contour 141 a of the flat surface region 141 on the outer peripheral surface of the front portion 14 forms a straight line or a substantially straight convex curve parallel or substantially parallel to the axis L direction. I have. That is, a line segment connecting any two points on the outline 141a along the shortest path along the outline 141a is outside or equal to a straight line connecting the two points. In other words, the flat surface region 141 does not include a recess recessed toward the axis L of the barrel 1 in the interior thereof. Further, the contour 141a of the flat surface area 141 on the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 are substantially linear, and the step between the former and the latter is very small. In the illustrated example, the contour 141 a of the flat surface area 141 on the outer peripheral surface of the front part 14 is located slightly inward (on the side closer to the axis L of the barrel 1) than the contour 13 a of the outer peripheral surface of the rear part 13. This is to make the peripheral edge of the oval shape of the flat surface region 141 beautiful in the plan view shown in FIG. However, the outer surface of the flat surface region 141 and the outer surface of the rear portion 13 are so arranged that the outline 141a of the flat surface region 141 of the outer surface of the front portion 14 and the outline 13a of the outer peripheral surface of the rear portion 13 are completely straight in a side view. It may be molded.

  The curved surface region 142 on the outer peripheral surface of the front portion 14 is a curved surface having a larger curvature than the flat surface region 141. Then, as shown in the cross-sectional view taken along the line BB of FIG. 6, the curved surface region 142 is substantially flush with the outer peripheral surface of the rear portion 13 except for a portion 142 a connected to the flat surface region 141. . That is, the curved surface region 142 is a partial cylindrical surface continuous with the outer peripheral surface of the rear portion 13 except for the connection portion 142a, the outer diameter of which is equal to the outer diameter of the outer peripheral surface of the rear portion 13. In turn, a portion 142 a of the curved surface region 142 that connects to the planar view region protrudes outward from the outer peripheral surface of the rear portion 13. This is a shape for enlarging the width dimension of the flat surface area 141 while adjusting the thickness of the front portion 14 of the barrel 1 to the thickness of the rear portion 13. As shown in FIG. 5, the line of intersection of the cut surface orthogonal to the axis L of the barrel 1 and the curved surface region 142 (the contour corresponding to the outer peripheral surface of the curved surface region 142 in a cross-sectional view) is: Except for the connection portion 142a, the shape is a perfect arc.

  In the present embodiment, the shaft cylinder 1 held by the user's finger has a rear portion 13 extending in the direction of the axis L, and a front portion of the rear portion 13 extending in the direction of the axis L to extend in the direction of the axis L. A flat surface area or a substantially flat flat convex curved surface, which is extended in parallel or substantially parallel to the direction of the axis L, is formed in a portion of the surface where the user's finger touches, and other portions are formed. A front portion 14 which is a curved surface region 142 having a larger curvature than the flat surface region 141, and a front end portion 15 which is connected to the front of the front portion 14 and has a tapered tapered shape to protrude the writing tip 2 for writing. A writing instrument provided with:

  According to the present embodiment, as shown in FIGS. 13A to 13C, one of the thumb, the index finger and the middle finger of the user holding the writing instrument is placed on the flat surface area 141 of the front portion 14 of the barrel 1. And the other two fingers are in contact with the curved surface area 142. As a result, the relative direction and posture of the barrel 1 with respect to the user's fingers are stabilized, and writing can be performed with a light force, even if the user does not apply force to the fingers. Yet, unlike a traditional pencil with a hexagonal cross section, it is difficult to give the user's finger a sharp feeling that the ridge line (edge) where multiple flat surfaces intersect bites into the finger, providing comfortable writing it can.

  Being able to stably hold the barrel 1 with a small force leads to a reduction in writing pressure during writing, which can contribute to reducing fatigue of fingers and arms of the user. In addition, when the ink filled in the refill of the writing implement has a relatively low viscosity (for example, a water-based gel ink or a low-viscosity oil-based ink), writing can be performed very smoothly in combination with the original writing comfort of such ink. It is possible to do. Conversely, in a writing instrument filled with low-viscosity ink, if the user unnecessarily puts force on his / her finger and grips the barrel 1 to increase the writing pressure, the smoothness of writing may be impaired. However, by employing the barrel 1 of the present embodiment, it can be expected that unnecessary increase in writing pressure is suppressed, and that smoothness of writing is maintained.

  The flat surface region 141 on the outer peripheral surface of the front portion 14 and the outer peripheral surface of the distal end portion 15 are continuous in a convex curved shape, and a dent exists at the boundary between the flat surface region 141 and the outer peripheral surface of the distal end portion 15. Therefore, for a user having a portion close to the distal end portion 15 of the barrel 1, the position at which the barrel 1 is gripped by a finger can be flexibly changed without a sense of incongruity. Therefore, it is a highly convenient writing instrument that can respond to individual differences.

  The curved region 142 on the outer peripheral surface of the front portion 14 is substantially flush with the outer peripheral surface of the rear portion 13 except for a portion 142a connected to the flat surface region 141. It is possible to create an appearance in which up to 14 are continuously and linearly continuous, and it is possible to enhance the appearance and aesthetic appearance of a writing instrument.

  Further, since the contour 141a of the flat surface area 141 on the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 form the same straight line or substantially the same straight line, the front portion 14 is flat. The surface region 141 is not greatly depressed with respect to the outer peripheral surface of the rear portion 13, in other words, the outer peripheral surface of the rear portion 13 does not protrude more than the flat surface region 141 of the front portion 14, so that the user can remove the shaft cylinder 1. In addition to being easy to hold naturally, the pressure on the base of the index finger of the user by the rear portion 13 of the barrel 1 is reduced.

  <Second Embodiment> In a second embodiment described below, the outer shape of the front portion 14 of the barrel 1 is changed from the first embodiment. Hereinafter, a configuration specific to the present embodiment will be described. The writing core, knock mechanism, and the like can be configured in the same manner as in the first embodiment (further, the existing writing implement), and thus the description is omitted here.

  The writing implement of the present embodiment is a knock-type ballpoint pen, similar to the first embodiment. The barrel 1 of the writing instrument also has a rear portion 13 extending along the axis L direction, a front portion 14 extending in front of the rear portion 13 and extending along the axis L direction, and a front portion extending in front of the front portion 14. And a tapered tip end portion 15 whose diameter becomes smaller as going toward. Most of the rear portion 13 is formed by the rear shaft 11, but the front end portion, the front portion 14, and the front end portion 15 of the rear portion 13 are formed by the front shaft 12. The writing mechanism 2 which is the tip of the writing core protrudes from the tip 15.

  The outer peripheral surface of the rear portion 13 is entirely cylindrical. In contrast, a single flat surface region 141 and a curved surface region 142 other than the flat surface region 141 exist on the outer peripheral surface of the front portion 14. The flat surface region 141 is a portion of the outer peripheral surface of the front portion 14 where the user's finger is in contact, and has a substantially flat surface shape that is expanded parallel or substantially parallel to the axis L direction. In particular, as shown in the cross-sectional view taken along the line CC of FIG. 11, the flat surface region 141 is not a completely flat surface but a convex curved surface slightly bulging outward. However, the flat surface region 141 may be formed into a completely flat surface.

  The flat surface region 141 of the outer peripheral surface of the front portion 14 is continuous to form a convex curved surface together with the outer peripheral surface of the tip portion 15 having a truncated conical shape. There is no recess at the boundary toward the axis L of the barrel 1. In other words, in the side view shown in FIG. 9, the contour 141 a of the flat surface area 141 and the contour 15 a of the outer peripheral surface of the distal end portion 15 are continuous to form a convex curve.

  In addition, in the side view shown in FIG. 9, the contour 141 a of the flat surface region 141 on the outer peripheral surface of the front portion 14 forms a straight line or a substantially straight convex curve parallel or substantially parallel to the axis L direction. I have. That is, a line segment connecting any two points on the outline 141a along the shortest path along the outline 141a is outside or equal to a straight line connecting the two points. In other words, the flat surface region 141 does not include a recess recessed toward the axis L of the barrel 1 in the interior thereof. Furthermore, the outline 141a of the flat surface area 141 on the outer peripheral surface of the front part 14 and the outline 13a of the outer peripheral surface of the rear part 13 are substantially linear, and the step between the former and the latter is very small. In the illustrated example, the contour 141a of the flat surface region 141 on the outer peripheral surface of the front portion 14 is located slightly inward of the contour 13a of the outer peripheral surface of the rear portion 13, but this is a plan view shown in FIG. In this case, the elliptical peripheral edge of the flat surface region 141 is formed in a beautiful shape. However, the outer surface of the flat surface region 141 and the outer surface of the rear portion 13 are so arranged that the outline 141a of the flat surface region 141 of the outer surface of the front portion 14 and the outline 13a of the outer peripheral surface of the rear portion 13 are completely straight in a side view. It may be molded.

  The curved surface region 142 on the outer peripheral surface of the front portion 14 is a curved surface having a larger curvature than the flat surface region 141. 12, the curved surface region 142 bulges outward from the outer peripheral surface of the rear portion 13 and has a curved surface region except for a front end portion connected to the front end portion 15 as shown in a cross-sectional view taken along line DD of FIG. The outer diameter of the region 142 is larger than the outer diameter of the outer peripheral surface of the rear portion 13. More specifically, the diameter of the curved surface region 142 gradually increases from the rear end continuous with the outer peripheral surface of the rear portion 13 toward the front, and reaches the maximum diameter halfway. Thereafter, the diameter of the curved surface region 142 becomes smaller as approaching the distal end portion 15, and the diameter at the front end of the curved surface region 142 becomes equal to the diameter of the rear end of the distal end portion 15. As shown in FIG. 11, an intersection line between the cut surface orthogonal to the axis L of the barrel 1 (or the writing instrument) and the curved surface region 142 (corresponding to the outer peripheral surface of the curved surface region 142 in a cross-sectional view). Is a true arc.

  In the present embodiment, the shaft cylinder 1 held by the user's finger has a rear portion 13 extending in the direction of the axis L, and a front portion of the rear portion 13 extending in the direction of the axis L to extend in the direction of the axis L. A flat surface area or a substantially flat flat convex curved surface, which is extended in parallel or substantially parallel to the direction of the axis L, is formed in a portion of the surface where the user's finger touches, and other portions are formed. A front portion 14 which is a curved surface region 142 having a larger curvature than the flat surface region 141, and a front end portion 15 which is connected to the front of the front portion 14 and has a tapered tapered shape to protrude the writing tip 2 for writing. A writing instrument provided with:

  According to the present embodiment, as shown in FIGS. 13A to 13C, one of the thumb, the index finger and the middle finger of the user holding the writing instrument holds the flat surface area 141 of the front portion 14 of the barrel 1. And the other two fingers are in contact with the curved surface area 142. As a result, the relative direction and posture of the barrel 1 with respect to the user's fingers are stabilized, and writing can be performed with a light force, even if the user does not apply force to the fingers. Yet, unlike a traditional pencil with a hexagonal cross section, it is difficult to give the user's finger a sharp feeling that the ridge line (edge) where multiple flat surfaces intersect bites into the finger, providing comfortable writing it can.

  Being able to stably hold the barrel 1 with a small force leads to a reduction in writing pressure during writing, which can contribute to reducing fatigue of fingers and arms of the user. In addition, when the ink filled in the refill of the writing instrument has a relatively low viscosity, the writing can be performed very smoothly in combination with the original writing comfort of the ink. Conversely, in a writing instrument filled with low-viscosity ink, if the user unnecessarily puts force on his / her finger and grips the barrel 1 to increase the writing pressure, the smoothness of writing may be impaired. However, by employing the barrel 1 of the present embodiment, it can be expected that unnecessary increase in writing pressure is suppressed, and that smoothness of writing is maintained.

  The flat surface region 141 on the outer peripheral surface of the front portion 14 and the outer peripheral surface of the distal end portion 15 are continuous in a convex curved shape, and a dent exists at the boundary between the flat surface region 141 and the outer peripheral surface of the distal end portion 15. Therefore, for a user having a portion close to the distal end portion 15 of the barrel 1, the position at which the barrel 1 is gripped by a finger can be flexibly changed without a sense of incongruity. Therefore, it is a highly convenient writing instrument that can respond to individual differences.

  Since the curved surface area 142 on the outer peripheral surface of the front portion 14 bulges outward from the outer peripheral surface of the rear portion 13, regardless of the outer diameter of the rear portion 13 of the barrel 1, Not only is it easy to design the outer diameter to an optimal size that fits the user's fingers, but it is also possible to make the appearance design of the writing implement novel.

  Further, since the contour 141a of the flat surface area 141 on the outer peripheral surface of the front portion 14 and the contour 13a of the outer peripheral surface of the rear portion 13 form the same straight line or substantially the same straight line, the front portion 14 is flat. The surface region 141 is not greatly depressed with respect to the outer peripheral surface of the rear portion 13, in other words, the outer peripheral surface of the rear portion 13 does not protrude more than the flat surface region 141 of the front portion 14, so that the user can remove the shaft cylinder 1. In addition to being easy to hold naturally, the pressure on the base of the index finger of the user by the rear portion 13 of the barrel 1 is reduced.

  Note that the present invention is not limited to the embodiment described in detail above. For example, the writing implement is not limited to a ballpoint pen. In other words, the writing lead is not always a ballpoint pen refill. Even when the writing implement is a pen other than a ball-point pen (for example, a felt-tip pen), the writing core is provided with a mechanism for transferring ink to paper or the like at the tip of an ink-filled container. The mechanism is the tip of the brush. Alternatively, when the writing implement is a mechanical pencil, the writing lead is a pencil lead, and a mechanism for extending the writing lead and projecting from the tip of the barrel is housed in the barrel together with the writing lead.

  Also, in the flat surface area and / or the curved surface area on the outer surface of the front part of the barrel, unevenness having a width or diameter of 1 mm or less, which is significantly finer than the thickness of the user's finger or the size of the finger joint, It does not prevent providing grooves, holes and the like.

  Other specific configurations of each part can be variously modified without departing from the spirit of the present invention.

  INDUSTRIAL APPLICATION This invention is applicable to the writing implement which accommodates the writing lead which implements the function for performing writing in a barrel.

DESCRIPTION OF SYMBOLS 1 ... Shaft tube 13 ... Rear part 13 ... Rear part outline in side view 14 ... Front part 141 ... Flat surface area 141a ... Flat part area outline in side view 142 ... Curved area 142a ... Portion connected to flat surface area 15 ... Tip Part 2: Brush tip L: Shaft center

Claims (4)

The shaft barrel held by the user's fingers,
A rear portion extending along the axial direction,
The rear portion extends forward and extends along the axial direction, and a portion of the outer peripheral surface where the user's finger is in contact is a flat surface or a substantially flat surface convex curved surface which is parallel or substantially parallel to the axial direction. The only flat surface area extended to is formed, the other portion is a curved surface region having a larger curvature than the flat surface region, a front portion,
A front end portion that is formed in a tapered shape that is continuous with the front of the front portion and that protrudes a writing tip for writing ;
A portion connected to the flat surface region in the curved surface region of the outer peripheral surface of the front portion is swelled outward from the outer peripheral surface of the rear portion,
A writing instrument with a cylindrical outer rear surface . The writing instrument according to claim 1, wherein a flat surface area on an outer peripheral surface of the front portion and an outer peripheral surface of the distal end portion are continuous in a convex curved shape. The writing instrument according to claim 1, wherein a curved surface region on the outer peripheral surface of the front portion is substantially flush with the outer peripheral surface of the rear portion except for a portion connected to the flat surface region. Claim 1, 2 or 3 writing implement according the outline of the flat surface area of the outer peripheral surface of the side view the front and the contour of the outer peripheral surface of the rear portion forms a collinear or nearly collinear.

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